The formula to calculate Roof Waste (RW) is:
\[ RW = RA \times \frac{WP}{100} \]
Where:
Roof waste refers to the additional material that is often needed in a roofing project beyond the exact measurements of the roof area. This waste accounts for cutting, fitting, and overlap of roofing materials. Typically, roofing projects have a waste percentage of about 10-15% due to these factors.
Let's consider an example:
Using the formula to calculate Roof Waste:
\[ RW = 2000 \times \frac{12}{100} = 240 \, \text{ft²} \]
This means that you should account for approximately 240 ft² of roof waste for a total roof area of 2000 ft² with a 12% waste percentage.